I am either looking at getting a 10" mini wireless keyboard with built in mouse or a wireless mouse controller (the latter using windows onscreen virtual keyboard.
I am using to play divx movies, web surfing and the occasional video game (rarely). I am close enough I could plug in a usb keyboard when necessary.
I like the idea of the mini keyboard, but I think it would be a hassle when just using it watch movies (and pausing to go to the bathroom).
I also will use it to watch episodes I missed that are stored online, like my heroes (nbc.com – blows my mind that they keep the whole episode online as decent resolution)